增加

减少

不变

先是增加,后又减少,分界角为 =45 0

价格指标可比性

时间的可比性

满足需要的可比性

消耗费用的可比性

效益可比性

价格指标可比性

满足需要的可比性

时间可比性

消耗费用的可比性

效益可比性

①③⑤

②④⑦

④⑤⑦

③⑥⑦

价格指标可比性

时间可比性

满足需要的可比性

消耗费用的可比性

效益可比性

estimate

donation

transform

resources

subsequent

circumstances

intense

embarrassed

advocate

confidence 1. Given the chance to show his ability, he regained and began to succeed in school. 2. People are beginning to realize that to nature at will is the biggest mistake that man has ever made. 3. It was difficult to how many people had been wounded in the earthquake 4. As music plays an important role in our life, many music teachers and educators taking up a musical instrument at a young age. 5. I got from him only a letter, which was put on my office desk; to the receipt of this letter I have never heard from him. 6. John believes that the of food to the hungry is more helpful than giving money. 7. He was when he discovered that he didn't have enough money to pay for the red wine he had ordered. 8. It is well known that China is a country with rich natural and a very big population. 9. They kept on trying their best to develop their business, but in suc h market competition, they had no idea if success would come along one day. 10. This rule should be entirely clear in the min ds of everyone and should not be misunderstood under any .